AD9854ASTZ

Overview

The AD9854ASTZ is a CMOS 300 MSPS quadrature complete DDS synthesizer from Analog Devices, packaged in an 80-lead LQFP. It integrates two high-speed 12-bit DACs and a 48-bit frequency accumulator to generate programmable I and Q outputs. The device operates on a single 3.3 V supply and supports frequencies up to 200 MHz with the internal multiplier enabled. Key specifications include dual 48-bit frequency registers, dual 14-bit phase offset registers, and a 12-bit amplitude modulation capability. It features serial or parallel programming interfaces and operates within an industrial temperature range of -40°C to +85°C.

Feature Summary

• Generates digitally programmable I and Q sine and cosine outputs using advanced Direct Digital Synthesis technology.
• Supports multiple modulation modes including FSK, BPSK, PSK, chirp, and AM via dedicated control pins and registers.
• Integrates a programmable reference clock multiplier circuit capable of generating system clocks from lower frequency inputs.
• Includes an ultrahigh speed comparator for agile clock generator applications with low jitter performance.

Applications

• Agile, quadrature local oscillator (LO) frequency synthesis
• Programmable clock generators
• FM chirp source for radar and scanning systems

Procurement Notes

Verify the specific suffix ASTZ corresponds to the 80-lead LQFP package variant with a maximum internal clock rate of 200 MHz when the multiplier is active. Confirm that the ordering information matches the manufacturer's current datasheet revision to ensure compatibility with the intended application requirements.

Selection Notes

Select this component for designs requiring simultaneous quadrature output generation with high dynamic performance. Ensure the system clock source aligns with the 200 MHz limit for the ASTZ variant. Consider thermal management guidelines due to power dissipation characteristics at high operating frequencies.

Part Context

The AD9854 belongs to the Analog Devices DDS family, offering pin-for-pin compatibility with the AD9852 single-tone synthesizer. It utilizes 0.35 µm CMOS technology to provide high functionality on a single supply, distinguishing it from older bipolar DDS solutions by its integration of digital multipliers and advanced filtering capabilities.

Replacement Considerations

The AD9852ASTZ is a compatible single-tone alternative if quadrature outputs are not required. For higher frequency operations exceeding 200 MHz, the AD9854ASVZ variant supports up to 300 MHz operation.